Organic-inorganic composite solid electrolyte and in-situ preparation method thereof, and organic-inorganic composite solid electrolyte membrane and in-situ preparation method thereof

Abstract

The invention discloses an in-situ preparation method of an organic-inorganic composite solid electrolyte. The in-situ preparation method of the organic-inorganic composite solid electrolyte comprisesthe steps of: the step 1, dissolving a polymer monomer 1, 3-dioxolane and first lithium salt in a small molecular solvent to prepare a first mixed solution; the step 2, dissolving a polymerization initiator in the small molecular solvent to prepare a polymerization initiator solution; the step 3, dissolving tetraethyl orthosilicate and second lithium salt in formic acid to prepare a second mixedsolution; the step 4, mixing the first mixed solution with the second mixed solution to obtain a third mixed solution; the step 5, mixing the polymerization initiator solution with the third mixed solution to obtain a solid electrolyte solution; and the step 6, drying the solid electrolyte solution to obtain the composite solid electrolyte. The invention also discloses an organic-inorganic composite solid electrolyte, an organic-inorganic composite solid electrolyte membrane and the corresponding preparation methods. The room-temperature conductivity of the solid electrolyte is effectively improved and the problem of poor interface contact of the solid electrolyte is effectively solved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an organic-inorganic composite solid electrolyte, an electrolyte membrane and an in-situ preparation method thereof. Background technique [0002] At present, lithium-ion batteries have the advantages of high voltage, high specific energy, many cycle times, and long storage time. They are widely used in consumer electronics, new energy vehicles, and energy storage. The electrical performance, service life and The study of safety performance is extremely important. [0003] For solid-state lithium-ion batteries, their high energy density and high safety have attracted much attention. Currently, solid-state electrolytes for solid-state lithium-ion batteries that have been extensively studied include oxide electrolytes, sulfide electrolytes, and polymer electrolytes. Among them, the polymer solid electrolyte has good elasticity, is easy to form a film, has good mecha...

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Problems solved by technology

[0004] However, polymer solid electrolytes have low room temperature ionic conductivity and poor contact between heterogeneous interfaces, which have always restricted the development prospects of polymer electrolytes and affected large-scale applications.

[0005] Therefore, in view of the low conductivity and poor interface contact of polymer solid electrolytes used in solid-state lithium-ion batteries, there is an urgent need for a solid-state electrolyte technology to improve the room-temperature conductivity of solid-state electrolytes and realize solid-state electrolytes and electrode active materials. And the soft contact between the solid electrolyte and the electrode, effectively solving the solid-solid interface problem between the solid electrolyte and the electrode active material and between the solid electrolyte and the electrode

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